Morning Mike,
Just to add to Ioan's comments, one other think to consider is
inspection. If your assembly is going to be visually inspected by a
human, it would make spotting a wrong polarity component more likely if
everything was oriented the same way.
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Thursday, March 01, 2007 6:53 AM
To: [log in to unmask]
Subject: Re: [TN] Component Orientation Survey
Mike,
I could give you the "it depends", but I will make it slightly easier:
- the SMT components can have any orientation you want, so you place
them the way that suits you better
- the TH parts are better off if they are all oriented the same way (all
the ICs same orientation, all the polarized axials and radials same
orientation).
Why? It comes from the insertion machines and the fact that we want
maximum productivity. The SMT inserters rotate the part, while the TH
inserters rotate the PCB. The rotation of the SMT parts is done on the
fly, with no speed loss, while indexing the board in the TH inserters is
long and if you turn the board once (90 degrees) you have to finish all
the 360deg, in order to bring the board in the loading position. The
rotation of the TH machine table is made in 90 deg increments and making
a full 360 can very oftenly be longer than the insertion time.
Regards,
Ioan
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Green, Mike
Sent: Wednesday, February 28, 2007 8:59 PM
To: [log in to unmask]
Subject: [TN] Component Orientation Survey
When you design boards, do you:
-lay out similar polar components oriented in the same direction for
ease of manufacture regardless of the shortest routing or -lay out each
component oriented in the best position for routing regardless of the
orientation of other similar parts?
We have a difference of opinion as to which is more prevalent practice.
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